In order to grow Potatoes I would suggest to follow the instructions below:

Unpack your seed potatoes immediately on delivery.

its not necessary to chit first early potatoes, though this would help speed up their growth. You should chit second earlies, and maincrop potatotesprior to planting. Stand them rose end up (the end with the most small eyes in the skin) in an egg box or shallow tray in a cool but frost-free, light and well-ventilated room so they can begin chitting (shooting). A temperature of 10°C (50°F) is ideal.

Leave for 3-4 weeks, and short dark shoots (chits) will emerge from the rose end. They will be ready to plant when these shoots are about 3cm (1in) long. Rub off the weaker shoots, leaving about 4 per tuber. If you leave all the shoots on, you will get more potatoes but they will be smaller. Take care not to damage the shoots when handling or planting.

Soil should be fertile and well-draining. For optimum harvests, particularly if the soil is heavy, dig in some well-rotted manure into the soil in the autumn/winter before planting. For lighter soils, just add some well-rotted manure or compost to the trench at the time of planting.

Planting can be done from the end of February. Early plantings will benefit from fleece protection.

Dig a trench about 10cm (4in) deep and add some of our Organic Potato Fertiliser to the soil. Place the tubers in the trench, rose end up, about 10cm (4in) deep, 30cm (12in) apart, with 60cm (24in) between rows. Alternatively, plant to the same depth and distance apart in a large container or growing bag. Cover with soil and water in.

As soon as growth appears, protect the young shoots from frost by drawing up soil around them or moving pots or bags into a more sheltered position, such as a cool greenhouse. When the stems reach 23cm (9in), draw up more soil around them to prevent the tubers near the surface from turning green.